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+- Fixed a crash in `DeepgramSTTService` when an `STTUpdateSettingsFrame` arrived before the WebSocket handshake completed (for example, when pushing an update upstream on `StartFrame`). The settings-triggered reconnect cancelled the in-flight connection task before its keepalive task was created, causing an `UnboundLocalError: cannot access local variable 'keepalive_task'` in the handler's `finally` block.